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Related Experiment Video

Updated: May 22, 2026

Computerized Dynamic Posturography for Postural Control Assessment in Patients with Intermittent Claudication

Computerized Dynamic Posturography for Postural Control Assessment in Patients with Intermittent Claudication

Published on: December 11, 2013

Continuous equilibrium scores: factoring in the time before a fall.

Scott J Wood¹, Millard F Reschke, F Owen Black

¹Division of Space Life Sciences, Universities Space Research Association, Houston, TX 77058, USA. scott.j.wood@nasa.gov

|May 30, 2012

Summary

A new continuous equilibrium (cEQ) score modifies posturography analysis by incorporating fall timing. This enhanced balance assessment differentiates fall types and improves statistical analysis for better clinical insights.

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Area of Science:

Biomechanics
Neurology
Rehabilitation Science

Background:

The standard equilibrium (EQ) score in computerized dynamic posturography has limitations due to its mixed discrete-continuous distribution.
Current methods treat all falls equally, hindering detailed analysis of balance recovery and fall mechanisms.

Purpose of the Study:

To introduce a continuous equilibrium (cEQ) score as an enhancement to traditional posturography.
To improve the statistical analysis of balance data by creating a continuous variable that accounts for fall timing.

Main Methods:

Modified the EQ score formula to scale peak-to-peak sway data from trials with falls by the percentage of the trial completed.
Retained original EQ scores for trials without falls.
Analyzed 5315 Sensory Organization Test trials, including 81 falls, comparing original EQ and cEQ distributions.

Main Results:

The cEQ score maintains a continuous distribution, with falls occupying the lower score range.
The cEQ demonstrated near-perfect discrimination between trials with and without falls (Area Under the Curve = 0.997).
The cEQ score can differentiate between early (ballistic) and later falls within a trial.

Conclusions:

The cEQ score offers a more nuanced assessment of balance control during posturography.
This method enhances the ability to distinguish between different types of falls based on timing.
The approach is adaptable for other balance tests involving incomplete trials or fall data.